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Female Anna's Hummingbird (Calypte anna) feeds both of her chicks (note emerging pin feathers); (San Francisco, CA)

Always first pausing to be aware of her surroundings, a female Anna's Hummingbird (Calypte anna) feeds both of her growing chicks (note emerging pin feathers); (San Francisco, CA)

Female Anna's Hummingbird (Calypte anna) stetching her back and wings while brooding; (San Francisco, CA)

While brooding, a female Anna's Hummingbird (Calypte anna) will at specific times work her tail and body in a series of repeated up-and-down articulations, much like a bellows system, to circulate air around the eggs; (San Francisco, CA)

Female Anna's Hummingbird (Calypte anna) guarding her eggs, defiant ... and with wing ready to fly if need-be; (San Francisco, CA)

Female Anna's Hummingbird (Calypte anna) craning her neck and staying still while a plane goes overhead several thousand feet up ...the silhouette still reminding her of a possible predator; (San Francisco, CA)

Female Anna's Hummingbird (Calypte anna) preening her nest; (San Francisco, CA)

Female Anna's Hummingbird (Calypte anna) feeding both of her chicks (still very early-on); (San Francisco, CA)

Female Anna's Hummingbird (Calypte anna) preparing to feed first-born; (San Francisco, CA)